Problem with E-studio 550

[makaule]

One e-studio 550 , began doing lots of black spots on copies after about 6K. And the other one began doing this after about 80K copies after chanhing drum, developer and other parts ??? Resetted all counters, made 05-200, and did everything under instructions but.. I dont understand what i did wrong ?
Help please !!!

[CopierTechofOmens]

Check to see where the toner drop is coming from. DV or Drum cleaning problem? Check waste bag and related augers,drives,gears. It sounds like a cleaning problem if it's happening a while after you just cleaned it out.

Side note: Had a customer complain about random dots on prints. Turned out to be crappy recycled paper. It already had the dots on it.

[makaule]

The problem is that the cleaning is ok. All new blades are installed. It seems that it's happening becouse of dev unit. Maybe smth is wrong with toner ? I'm trying to check it for overtonering and write how it's going on..

[makaule]

made 05-200 and 05-290 once again and the problem disapeared for about 6K copies. any ideas ?

[makaule]

After performing ATD, lowered 05-201 from 91 to about 70, have done ~20K copies already and everything is ok till now..